<?php
final class Config {
	private $data = array();

	public function get($key) {
		return (isset($this->data[$key]) ? $this->data[$key] : NULL);
	}

	public function set($key, $value) {
		$this->data[$key] = $value;
	}

	public function has($key) {
		return isset($this->data[$key]);
	}
	 
	public function load($filename) {
		$file = DIR_CONFIG . $filename . '.php';

		if (file_exists($file)) {
			$cfg = array();
			 
			require($file);
			 
			$this->data = array_merge($this->data, $cfg);
		} else {
			exit('Error: Could not load config ' . $filename . '!');
		}
	}
}
?>